A hand-off in the "Sin City" heroin operation in Park Slope - Brooklyn, NY (credit: NYC Office of the Special Narcotics Prosecutor)

Those streets featured the main target of the investigation speeding along on a brightly colored three-wheeled motorcycle, tossing hundreds of glassines of heroin into the car windows of his clients, taking an envelope full of cash in return, and speeding off.

Special narcotics prosecutor Bridget Brennan said more than 60 of these sales were made to undercover cops in broad daylight on leafy brownstone-lined streets next to Prospect Park.

“When we arrested him and recovered that motorcycle we found a motorcycle helmet with “sin city” emblazoned on it and we recovered 1,400 glassines of heroin from inside the motorcycle itself,” she told WCBS 880 reporter Irene Cornell.